<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* 圆角 */
        .box1{
            width: 56px;
            height: 56px;
            background-color: purple;
            border-radius: 20px;
        }

        /* 阴影 */
        .box2{
            width: 400px;
            height: 400px;
            background-color: aqua;
            margin: 0 auto;
            box-shadow: 10px 10px 10px rgba(0, 0, 0, 0.5);

        }

    </style>
</head>
<body>
    

    <div class="box1"></div>
    <div class="box2"></div>

</body>
</html>